Factors affecting the displacement of the diaphragm wall of a deep excavation constructed by Bottom-up method in Ho Chi Minh City

Abstract

Currently, the land fund in big cities is becoming increasingly limited, leading to an increase in the demand for underground space exploitation. These underground spaces include basements of highrise buildings, underground traffic works such as subway tunnels, underground stations. The construction of deep excavation of these underground works is very complicated, there are many risks related to displacement and overall stability of the excavation.

The factors affecting the displacement and stability of the deep excavation are currently of great interest to researchers. This study applies the finite element method to evaluate the effect of diaphragm wall depth, thickness, the struts spacing in the horizontal and the magnitude of preloads in the support systems on displacement of diaphragm wall of deep excavation.

From the research results, it is shown that the depth and thickness of the diaphragm wall are factors that have a lot of influence on the overall displacement and stability of the excavation diaphragm wall. The struts spacing in the horizontal and the magnitude of preloads in the support systems greatly affect the overall stiffness of the diaphragm wall and the lateral displacement of the deep excavation diaphragm wall.

Keywords: Displacement; depth; thickness; diaphragm wall; spacing of struts; preloads.